Service Manual
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Dell#
Maintenance Using TDR
The time domain reectometer (TDR) is supported on all Dell Networking switch/routers.
TDR is an assistance tool to resolve link issues that helps detect obvious open or short conditions within any of the four copper pairs.
TDR sends a signal onto the physical cable and examines the reection of the signal that returns. By examining the reection, TDR is
able to indicate whether there is a cable fault (when the cable is broken, becomes unterminated, or if a transceiver is unplugged).
TDR is useful for troubleshooting an interface that is not establishing a link; that is, when the link is apping or not coming up. TDR is
not intended to be used on an interface that is passing trac. When a TDR test is run on a physical cable, it is important to shut
down the port on the far end of the cable. Otherwise, it may lead to incorrect test results.
NOTE: TDR is an intrusive test. Do not run TDR on a link that is up and passing trac.
To test and display TDR results, use the following commands.
1. To test for cable faults on the TenGigabitEthernet cable.
EXEC Privilege mode
tdr-cable-test tengigabitethernet slot/porttengigabitethernet slot/port/subport
Between two ports, do not start the test on both ends of the cable.
Enable the interface before starting the test.
Enable the port to run the test or the test prints an error message.
2. Displays TDR test results.
EXEC Privilege mode
show tdr tengigabitethernet slot/porttengigabitethernet slot/port/subport
Fanning out 40G Ports Dynamically
Splitting QSFP Ports to SFP+ Ports
The platform supports splitting a single 40G QSFP port into four 10G SFP+ ports using one of the supported breakout cables (for a
list of supported cables, refer to the Installation Guide or the Release Notes).
NOTE: You can split the 40G ports to 10G ports and vice —versa without reloading the device.
To split a single 40G port into four 10G ports, use the following command.
• Split a single 40G port into four 10G ports.
CONFIGURATION mode
stack-unit stack-unit port number portmode quad
– stack-unit: enter the stack member unit identier of the stack member to reset. The range is from 1 to 6.
– number: enter the port number of the 40G port to be split. In S6000–ON, all are 40 G ports. The range is from 1 to 32.
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Interfaces